Inverted Brayton Cycle for waste heat recovery in reciprocating internal combustion engines

Battista, Davide Di; Fatigati, Fabio; Carapellucci, Roberto; Cipollone, Roberto

doi:10.1016/j.apenergy.2019.113565

Cited by 40 publications

(15 citation statements)

References 30 publications

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“…Kennedy et al report about 5% decrease in brake specific fuel consumption. Di Battista et al demonstrated 3.5% of the brake mechanical power recovery [14], and 3.4% net efficiency increase in a later work [13] underlining the operability of the system only under the engine load above 70%.…”

Section: Studied Systemmentioning

confidence: 96%

“…But only recently this concept got a new wave of attention in the scientific literature. In particular, the application of IBC for the reciprocating engine bottoming is studied by Kennedy et al [12] and Di Battista et al [13] for light vehicles, or Di Battista et al [14] for heavy vehicles whose models show good results from thermodynamic point of view. Kennedy et al report about 5% decrease in brake specific fuel consumption.…”

Section: Studied Systemmentioning

confidence: 99%

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Techno-economic analysis of waste heat recovery by inverted Brayton cycle applied to an LNG-fuelled transport truck

et al. 2021

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Aiming for the better environmental and economic performance of traditional engines, waste heat recovery (WHR) technologies are actively studied to find their most beneficial applications. In this work, the inverted Brayton cycle (IBC) is investigated as a potential WHR solution for liquefied natural gas (LNG) fuelled transport truck. LNG being one of the less polluting fossil fuels is widely spreading nowadays in different industries due to the rapid development of the LNG supply chain in the world. LNG-fuelled cargo transportation follows this prevailing trend. Based on the overexpansion of flue gases to subatmospheric pressure, inverted Brayton cycle, in turn, is considered a prospective technology of WHR and techno-economic analysis of IBC in several configurations on-board of a heavy transport truck have been assessed. IBC is integrated into the engine cooling system in the basic layout, and additionally, it incorporates LNG regasification process in advanced configurations. Power balance based on Aspen Hysys model enables to perform system optimisation and gives preliminary design parameters of the system components. Cost function approach provides the basis for a preliminary economic assessment of the layouts. Although the system shows fuel economy of maximum about 2.1 %, analysis revealed the necessity to continue the search for better technical solutions in IBC-based systems to make them economically attractive due to high cost of installed equipment.

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Section: Studied Systemmentioning

confidence: 96%

Section: Studied Systemmentioning

confidence: 99%

Techno-economic analysis of waste heat recovery by inverted Brayton cycle applied to an LNG-fuelled transport truck

et al. 2021

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“…The pressure inside the chambers is assumed to be equal to the upstream static pressure, known immediately before the port opening. In Figure 1, three chambers are considered: the one that is performing the intake phase (named ch 1 ), the following (ch 2 ), and the previous chamber (ch 7 ), seen in the revolution speed sense. After the filling, during the expansion phase, the pressure is calculated during rotation, considering an adiabatic transformation.…”

Section: Mathematical Model Of Svrementioning

confidence: 99%

“…In order to recover the thermal energy of the exhaust gases, several opportunities have been introduced and compared [3]. Direct heat recovery options aim to exploit the residual enthalpy of the exhaust gases [4,5], but they still introduce unavoidable backpressure effects on the engine, also if sub-atmospheric turbines are considered, losing in many cases the effectiveness of the recovery [6,7]. Thermoelectric devices have been studied for expanders, simply reversing the speed of rotation and exchanging filling and emptying ports.…”

Section: Introductionmentioning

confidence: 99%

Experimental Validation of a New Modeling for the Design Optimization of a Sliding Vane Rotary Expander Operating in an ORC-Based Power Unit

et al. 2020

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Sliding Rotary Vane Expanders (SVRE) are often employed in Organic Rankine Cycle (ORC)-based power units for Waste Heat Recovery (WHR) in Internal Combustion Engine (ICE) due to their operating flexibility, robustness, and low manufacturing cost. In spite of the interest toward these promising machines, in literature, there is a lack of knowledge referable to the design and the optimization of SVRE: these machines are often rearranged reversing the operational behavior when they operate as compressors, resulting in low efficiencies and difficulty to manage off-design conditions, which are typical in ORC-based power units for WHR in ICE. In this paper, the authors presented a new model of the machine, which, thanks to some specific simplifications, can be used recursively to optimize the design. The model was characterized by a good level of physical representation and also by an acceptable computational time. Despite its simplicity, the model integrated a good capability to reproduce volumetric and mechanical efficiencies. The validation of the model was done using a wide experimental campaign conducted on a 1.5 kW SVRE operated on an ORC-based power unit fed by the exhaust gases of a 3 L supercharged diesel engine. Once validated, a design optimization was run, allowing to find the best solution between two “extreme” designs: a “disk-shaped”—increasing the external diameter of the machine and reducing axial length—and by a “finger-shaped” machine. The predictions of this new model were finally compared with a more complex numerical model, showing good agreement and opening the way to its use as a model-based control tool.

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“…Even in modern engines, these losses account for about 50% of the combustion heat released. [ 3 ] Several researchers [ 4–6 ] have used strategies to recover thermal energy from exhaust gas by means of turbochargers, Stirling cycles, organic Rankine cycles (ORCs), inverted Brayton–Joule cycles, and piezoelectric generation.…”

Section: Introductionmentioning

confidence: 99%

On Direct Injection of Supercritical Water into Spark Ignition Engines as a Strategy for Heat Recovery

2021

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A novel heat recovery strategy for internal combustion engines is proposed. The aim is to recover thermal energy from the engine exhaust gases and through cylinder walls to heat pressurized water to supercritical conditions and to directly inject such supercritical water into the combustion chamber. Herein, this strategy is applied to a spark ignition, four‐stroke, port fuel injection engine. An in‐house solver, which includes a heat exchanger model, has been developed to conduct numerical simulations of the apparatus. At first, the engine model has been validated by comparing the results with experimental measurements. Then, a parametric analysis has been conducted to maximize the engine efficiency by varying the injection start timing, the injector diameter, and the water/fuel ratio. A single‐objective genetic algorithm has been used to select the optimal set of such parameters. Finally, a multiobjective genetic algorithm has been used to maximize the engine efficiency and minimize the exhaust gas–water heat exchanger size. The results show that the proposed approach may lead to a significant increase in the engine efficiency, up to about 12%.

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Inverted Brayton Cycle for waste heat recovery in reciprocating internal combustion engines

Cited by 40 publications

References 30 publications

Techno-economic analysis of waste heat recovery by inverted Brayton cycle applied to an LNG-fuelled transport truck

Techno-economic analysis of waste heat recovery by inverted Brayton cycle applied to an LNG-fuelled transport truck

Experimental Validation of a New Modeling for the Design Optimization of a Sliding Vane Rotary Expander Operating in an ORC-Based Power Unit

On Direct Injection of Supercritical Water into Spark Ignition Engines as a Strategy for Heat Recovery

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